WHAT YOU GET : 2 detachable breastshields (21mm), 2 base connectors, 2 valves, 4 membranes. Does NOT include tubings. COMPATIBLE PUMPS AND PUMP PARTS: Madela Pump in Style (but not PIS with MaxFlow), Madela swing (but not Swing Maxi), and Madela Symphony breastpumps. Made by Maymom. Not original Madela pump parts. Compatible and interchangeable with Madela Personalfit connector, Madela breastshield, Madela tubing, Madela valves, Madela membranes, and Madela bottles. Comply with FDA regulations for plastic materials that contact food. Material does NOT contain BPA and DEHP. Can be sanitized with, boiling water, water steam or microwave-steam bags ERGONOMIC DESIGN: Longer tunnel and smooth angle. Suitable for elastic nipples EASY TO USE: Detachable breastshield for easy cleaning and working with most hands-free bras